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|
package chat
import (
"context"
"fmt"
"strings"
"sync"
"time"
"go.neonxp.ru/qchat/internal/config"
)
var (
helpMessage = "Available commands:\n" +
"/join [chan] - change current channel to [chan]\n" +
"/chans - list all chans\n" +
"/users - list all online users\n" +
"/me [message] - display message like from third person\n" +
"Formatting:\n" +
"- *Bold*\n" +
"- +Italic+\n" +
"- -Striked-\n" +
"- _Underline_\n" +
"ctrl+c - leave chat"
)
type Chat struct {
cfg *config.Config
users map[*User]struct{}
channels map[*Channel]struct{}
wg sync.WaitGroup
mu sync.RWMutex
}
func New(cfg *config.Config) *Chat {
return &Chat{
cfg: cfg,
users: make(map[*User]struct{}, 32),
channels: make(map[*Channel]struct{}, 32),
wg: sync.WaitGroup{},
mu: sync.RWMutex{},
}
}
func (c *Chat) Run(ctx context.Context) error {
for _, channel := range c.cfg.Channels {
c.NewChannel(ctx, channel.Name)
}
c.wg.Wait()
return nil
}
func (c *Chat) NewUser(username, identify string) *User {
u := &User{
Username: username,
Identify: identify,
Chans: map[string]*Channel{},
CurrentChan: nil,
Events: make(chan any, 32),
mu: sync.RWMutex{},
}
u.Events <- SystemMessage{
Message: fmt.Sprintf("Connected to %s chat server...\nType /help command for list available commands.", c.cfg.Server.Name),
}
ch := c.GetChannel("main")
if ch != nil {
u.JoinChan(ch)
}
c.users[u] = struct{}{}
return u
}
func (c *Chat) RemoveUser(u *User) {
c.mu.Lock()
defer c.mu.Unlock()
for ch := range c.channels {
ch.Leave(u)
}
close(u.Events)
delete(c.users, u)
}
func (c *Chat) NewChannel(ctx context.Context, name string) *Channel {
ch := &Channel{
Name: name,
Users: make(map[*User]struct{}, 32),
Events: make(chan any),
mu: sync.RWMutex{},
}
c.mu.Lock()
defer c.mu.Unlock()
c.channels[ch] = struct{}{}
c.wg.Go(func() {
ch.Listen(ctx)
})
return ch
}
func (c *Chat) GetChannel(name string) *Channel {
for ch := range c.channels {
if ch.Name == name {
return ch
}
}
return nil
}
func (c *Chat) Message(user *User, message string) {
if user.CurrentChan == nil {
return
}
user.CurrentChan.Events <- Message{
User: user,
Message: message,
Time: time.Now(),
}
}
func (c *Chat) SelfMessage(user *User, message string) {
if user.CurrentChan == nil {
return
}
user.CurrentChan.Events <- SelfMessage{
User: user,
Message: message,
}
}
func (c *Chat) SystemMessage(user *User, message string) {
user.Events <- SystemMessage{
Message: message,
}
}
func (c *Chat) Input(ctx context.Context, user *User, input string) {
cmd := strings.ToLower(input)
switch {
case strings.HasPrefix(cmd, "/me "):
c.SelfMessage(user, strings.TrimPrefix(input, "/me "))
case cmd == "/help":
c.SystemMessage(user, helpMessage)
case cmd == "/chans":
list := make([]string, 0, len(c.channels))
for ch := range c.channels {
list = append(list, ch.Name)
}
c.SystemMessage(user, "Chans:\n"+strings.Join(list, "\n"))
case cmd == "/users":
list := make([]string, 0, len(c.users))
for u := range c.users {
list = append(list, u.NUsername())
}
c.SystemMessage(user, "Users:\n"+strings.Join(list, "\n"))
case strings.HasPrefix(cmd, "/join "):
newChanName := strings.TrimPrefix(input, "/join ")
var newChan *Channel
for ch := range c.channels {
if ch.Name == newChanName {
newChan = ch
break
}
}
if newChan == nil {
newChan = c.NewChannel(ctx, newChanName)
}
user.CurrentChan.Leave(user)
user.JoinChan(newChan)
default:
c.Message(user, input)
}
}
|
